Hello All >From the "that's what you get for touching that" dept:
I've been testing the development versions of gcc and glibc (from svn and git) and lately I've seen some breakage related to libgcc_s.so. Current Glibc fails to build with a LD cannot find -lgcc_s error. Grepping the source for -lgcc_s shows that Makeconfig now includes -lgcc_s in its default LDFLAGS for libgcc_eh. The solution that works for me is to simply remove it: sed -i 's# -lgcc_s##' Makeconfig I also tried copying libgcc_s.so from the host into /tools/lib (that also worked). The buildlogs were identical for glibc in both cases so I think the sed is probably safe. So far so simple. With gcc it was a bit more complicated. With gcc-4.7-20120623 (ftp://ftp.fu-berlin.de/unix/languages/gcc/snapshots) The second pass of gcc fails while compiling libstdc++ with an error like this: libtool: link: /mnt/lfs/sources/gcc-build/./gcc/xgcc -shared-libgcc -B/mnt/lfs/sources/gcc-build/./gcc -nostdinc++ -L/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src -L/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs -B/tools/x86_64-unknown-linux-gnu/bin/ -B/tools/x86_64-unknown-linux-gnu/lib/ -isystem /tools/x86_64-unknown-linux-gnu/include -isystem /tools/x86_64-unknown-linux-gnu/sys-include -shared -nostdlib /tools/lib/../lib64/crti.o /mnt/lfs/sources/gcc-build/./gcc/crtbeginS.o .libs/compatibility.o .libs/compatibility-debug_list.o .libs/compatibility-debug_list-2.o .libs/compatibility-list.o .libs/compatibility-list-2.o .libs/compatibility-c++0x.o .libs/compatibility-atomic-c++0x.o .libs/compatibility-thread-c++0x.o -Wl,--whole-archive ../libsupc++/.libs/libsupc++convenience.a ../src/c++98/.libs/libc++98convenience.a ../src/c++11/.libs/libc++11convenience.a -Wl,--no-whole-archive -L/mnt/lfs/sources/gcc-build/x86_64-unk nown-lin ux-gnu/libstdc++-v3/src -L/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs -lm -L/mnt/lfs/sources/gcc-build/./gcc -L/tools/x86_64-unknown-linux-gnu/bin -L/tools/x86_64-unknown-linux-gnu/lib -L/tools/lib/../lib64 -L/tools/lib -lc -lgcc_s /mnt/lfs/sources/gcc-build/./gcc/crtendS.o /tools/lib/../lib64/crtn.o -Wl,-O1 -Wl,-z -Wl,relro -Wl,--gc-sections -Wl,--version-script=libstdc++-symbols.ver -Wl,-soname -Wl,libstdc++.so.6 -o .libs/libstdc++.so.6.0.17 ../src/c++11/.libs/libc++11convenience.a(functexcept.o): In function `operator()': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::_FUN()' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(functexcept.o): In function `_ZZSt9call_onceIMNSt13__future_base11_State_baseEFvRSt8functionIFSt10unique_ptrINS0_12_Result_baseENS4_8_DeleterEEvEERbEJKPS1_St17reference_wrapperIS8_ESF_IbEEEvRSt9once_flagOT_DpOT0_ENUlvE_4_FUNEv': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::__future_base::_State_base::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >, std::reference_wrapper<bool> >(std::once_flag&, void (std::__future_base::_State_base::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const&&, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >&&, std::reference_wrapper<bool>&&)::{lambda()#1}::_FUN()' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(functexcept.o): In function `_ZZSt9call_onceIMNSt13__future_base11_State_baseEFvRSt8functionIFSt10unique_ptrINS0_12_Result_baseENS4_8_DeleterEEvEERbEJKPS1_St17reference_wrapperIS8_ESF_IbEEEvRSt9once_flagOT_DpOT0_ENKUlvE_cvPFvvEEv': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::__future_base::_State_base::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >, std::reference_wrapper<bool> >(std::once_flag&, void (std::__future_base::_State_base::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const&&, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >&&, std::reference_wrapper<bool>&&)::{lambda()#1}::operator void (*)()() const' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(functexcept.o): In function `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::operator void (*)()() const': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::operator void (*)()() const' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(future.o): In function `operator()': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::_FUN()' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(future.o): In function `_ZZSt9call_onceIMNSt13__future_base11_State_baseEFvRSt8functionIFSt10unique_ptrINS0_12_Result_baseENS4_8_DeleterEEvEERbEJKPS1_St17reference_wrapperIS8_ESF_IbEEEvRSt9once_flagOT_DpOT0_ENUlvE_4_FUNEv': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::__future_base::_State_base::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >, std::reference_wrapper<bool> >(std::once_flag&, void (std::__future_base::_State_base::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const&&, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >&&, std::reference_wrapper<bool>&&)::{lambda()#1}::_FUN()' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(future.o): In function `_ZZSt9call_onceIMNSt13__future_base11_State_baseEFvRSt8functionIFSt10unique_ptrINS0_12_Result_baseENS4_8_DeleterEEvEERbEJKPS1_St17reference_wrapperIS8_ESF_IbEEEvRSt9once_flagOT_DpOT0_ENKUlvE_cvPFvvEEv': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::__future_base::_State_base::*)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >, std::reference_wrapper<bool> >(std::once_flag&, void (std::__future_base::_State_base::*&&)(std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()>&, bool&), std::__future_base::_State_base* const&&, std::reference_wrapper<std::function<std::unique_ptr<std::__future_base::_Result_base, std::__future_base::_Result_base::_Deleter> ()> >&&, std::reference_wrapper<bool>&&)::{lambda()#1}::operator void (*)()() const' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here ../src/c++11/.libs/libc++11convenience.a(future.o): In function `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::operator void (*)()() const': /mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: multiple definition of `void std::call_once<void (std::thread::*)(), std::reference_wrapper<std::thread> >(std::once_flag&, void (std::thread::*&&)(), std::reference_wrapper<std::thread>&&)::{lambda()#1}::operator void (*)()() const' .libs/compatibility-thread-c++0x.o:/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/mutex:815: first defined here collect2: error: ld returned 1 exit status make[5]: *** [libstdc++.la] Error 1 make[5]: Leaving directory `/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src' make[4]: *** [all-recursive] Error 1 make[4]: Leaving directory `/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/src' make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3' make[2]: *** [all] Error 2 make[2]: Leaving directory `/mnt/lfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3' make[1]: *** [all-target-libstdc++-v3] Error 2 make[1]: Leaving directory `/mnt/lfs/sources/gcc-build' make: *** [all] Error 2 Eww, ugly. Looking at the config.log in gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/ I see: ./conftest: error while loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory And: gcc_cv_have_tls=no It seems that the error is related to gcc's lack of thread local storage due to the fact that configure didn't find libgcc_s.so. The first pass of Gcc doesn't install libgcc_s.so so in order to make one available for the libstdc++ configure script to find I first tried simply copying libgcc_s.so from the host into /tools/lib. This worked but is obviously not suitable as it breaks the separation between the host and tools. Looking in gcc-build I can see libgcc_s.so.1 in gcc-build/$(uname -m)-unknown-linux-gnu/libgcc. If I copy that into /tools/lib, rm -rf gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3 and then run make again the build succeeds. In order to avoid the error entirely I had to (in gcc-build, just before running make): make all-target-libgcc cp $(uname -m)-unknown-linux-gnu/libgcc/libgcc_s.so.1 /tools/lib ln -s libgcc_s.so.1 /tools/lib/libgcc_s.so And then run make, make install and so on. I think we will need to do something similar when gcc-4.7.2 is released. Looking at the gcc bugzilla the problem seems to be related to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53675 but I'm not sure. Andy -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
